Resolves #844 by returning Ok(()) if the port, username or password is empty

[chanced]

resolves #844 by checking for a value before returning Err(()) in set_port, set_username and set_password.

[chanced]

This pull request is lacking in tests at the moment. I'll add them if ya'll are interested in it.

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.05% ⚠️

Comparison is base (0e25146) 82.44% compared to head (b4ff992) 82.39%.
Report is 22 commits behind head on master.

❗ Current head b4ff992 differs from pull request most recent head 941dade. Consider uploading reports for the commit 941dade to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #845      +/-   ##
==========================================
- Coverage   82.44%   82.39%   -0.05%     
==========================================
  Files          20       20              
  Lines        3343     3352       +9     
==========================================
+ Hits         2756     2762       +6     
- Misses        587      590       +3     

Files Changed	Coverage Δ
url/src/lib.rs	75.83% <50.00%> (-0.24%)	⬇️

... and 4 files with indirect coverage changes

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